To form informal agent nouns from abbreviations like 'CEO', some speakers simply append -'er to the abbreviation, producing forms such as CEO'er.

As a be-er, she often watched the world move around her without trying to change anything.

He gave up three ER in the fourth inning, which cost the team the game.

The historian pointed to the royal crest marked "ER" and explained it stood for Elizabeth Regina, signifying Queen Elizabeth.

At the party I kept hearing 'er name, and finally realized they were talking about her.

The blazon included er., the abbreviation used in heraldry for ermine.

In many words, adding -er to a verb turns it into someone who performs the action.

When you add -er to 'London', you form the word 'Londoner' to denote a resident of that city.

In his paper on Old English morphology, he noted that the obsolete plural suffix -er once formed the plurals of a handful of nouns.

When forming nouns, adding the suffix -er often creates a word that refers to a person or thing connected with an action, such as teacher or runner.